I installed LinuxMint 2.2 last night, and there was no notification during that installation process that a firewall had been set up. Although it's good practice and common for that to occur, it wasn't obvious.
Enhancement Requests include:
-- During Installation, mention that a firewall is automatically set up.
-- Include that information in the wiki and the forum (I could not readily find it.) Make it a sticky note on the forum.
-- Include that information available somewhere readily available from the Desktop--such as menus, online help, or online docs.